fix(postgres): resolve enum column change syntax error

src/Illuminate/Database/Schema/Grammars/PostgresGrammar.php

@@ -281,6 +281,15 @@ public function compileAutoIncrementStartingValues(Blueprint $blueprint, Fluent
     public function compileChange(Blueprint $blueprint, Fluent $command)
     {
         $column = $command->column;
+        $statements = [];
+
+        if ($column->type === 'enum') {
+            $constraintName = $blueprint->getTable().'_'.$column->name.'_check';
+            $statements[] = sprintf('alter table %s drop constraint if exists %s',
+                $this->wrapTable($blueprint),
+                $this->wrap($constraintName)
+            );
+        }
 
         $changes = ['type '.$this->getType($column).$this->modifyCollate($blueprint, $column)];
 
@@ -298,10 +307,23 @@ public function compileChange(Blueprint $blueprint, Fluent $command)
             }
         }
 
-        return sprintf('alter table %s %s',
+        $statements[] = sprintf('alter table %s %s',
             $this->wrapTable($blueprint),
             implode(', ', $this->prefixArray('alter column '.$this->wrap($column), $changes))
         );
+
+        if ($column->type === 'enum') {
+            $constraintName = $blueprint->getTable().'_'.$column->name.'_check';
+            $statements[] = sprintf('alter table %s add constraint %s check ("%s" in (%s))',
+                $this->wrapTable($blueprint),
+                $this->wrap($constraintName),
+                $column->name,
+                $this->quoteString($column->allowed)
+            );
+        }
+
+        // Return single statement or array of statements
+        return count($statements) === 1 ? $statements[0] : $statements;
     }
 
     /**
@@ -922,6 +944,10 @@ protected function typeBoolean(Fluent $column)
      */
     protected function typeEnum(Fluent $column)
     {
+        if ($column->change) {
+            return 'varchar(255)';
+        }
+
         return sprintf(
             'varchar(255) check ("%s" in (%s))',
             $column->name,

tests/Database/DatabasePostgresSchemaGrammarTest.php

@@ -1201,6 +1201,28 @@ public function testDropAllDomainsWithPrefixAndSchema()
         $this->assertSame('drop domain "schema"."alpha", "schema"."beta", "schema"."gamma" cascade', $statement);
     }
 
+    public function testNativeColumnModifyingOnPostgres()
+    {
+        $blueprint = new Blueprint($this->getConnection(), 'tasks', function ($table) {
+            $table->enum('status', ['pending', 'queued'])->default('pending')->change();
+        });
+
+        $statements = $blueprint->toSql();
+
+        $this->assertCount(4, $statements);
+
+        $this->assertStringContainsString('drop constraint if exists "tasks_status_check"', $statements[0]);
+
+        $this->assertStringContainsString('alter table "tasks" alter column "status" type varchar(255)', $statements[1]);
+        $this->assertStringNotContainsString('check (', $statements[1]);
+        $this->assertStringContainsString('set default \'pending\'', $statements[1]);
+        $this->assertStringContainsString('set not null', $statements[1]);
+
+        $this->assertStringContainsString('add constraint "tasks_status_check" check ("status" in (\'pending\', \'queued\'))', $statements[2]);
+
+        $this->assertStringContainsString('comment on column', $statements[3]);
+    }
+
     public function testCompileColumns()
     {
         $connection = $this->getConnection();

tests/Integration/Database/Postgres/DatabasePostgresSchemaBuilderAlterTableWithEnumTest.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace Illuminate\Tests\Integration\Database\Postgres;
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+use PHPUnit\Framework\Attributes\RequiresOperatingSystem;
+use PHPUnit\Framework\Attributes\RequiresPhpExtension;
+
+#[RequiresOperatingSystem('Linux|Darwin')]
+#[RequiresPhpExtension('pdo_pgsql')]
+class DatabasePostgresSchemaBuilderAlterTableWithEnumTest extends PostgresTestCase
+{
+    protected function afterRefreshingDatabase()
+    {
+        Schema::create('orders', function (Blueprint $table) {
+            $table->integer('id');
+            $table->string('name');
+            $table->enum('status', ['pending', 'processing'])->default('pending');
+        });
+    }
+
+    protected function destroyDatabaseMigrations()
+    {
+        Schema::drop('orders');
+    }
+
+    public function testChangeEnumColumnValues()
+    {
+        Schema::table('orders', function (Blueprint $table) {
+            $table->enum('status', ['pending', 'queued'])->default('pending')->change();
+        });
+
+        $this->assertTrue(Schema::hasColumn('orders', 'status'));
+        $this->assertSame('varchar', Schema::getColumnType('orders', 'status'));
+    }
+
+    public function testRenameColumnOnTableWithEnum()
+    {
+        Schema::table('orders', function (Blueprint $table) {
+            $table->renameColumn('name', 'title');
+        });
+
+        $this->assertTrue(Schema::hasColumn('orders', 'title'));
+    }
+
+    public function testChangeNonEnumColumnOnTableWithEnum()
+    {
+        Schema::table('orders', function (Blueprint $table) {
+            $table->unsignedInteger('id')->change();
+        });
+
+        $this->assertSame('int4', Schema::getColumnType('orders', 'id'));
+    }
+}